<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon>
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="500" :active="activeIndex-0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!-- Tabs区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position='top'>
          <el-tabs :tab-position="'left'" v-model="activeIndex" 
          :before-leave='beforeTabLeave' @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange">
                </el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单Item项 -->
              <el-form-item :label="item.attr_name" v-for="item in manyTableData"
              :key='item.attr_id'>
              <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals" >
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key='i' 
                  border class="checkbox"></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key='item.attr_id'>
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- action表示上传地址，listtype表示呈现效果
              action="http://vueshop.pixiv.download/api/private/v1/upload" 
              action="https://lianghj.top:8888/api/private/v1/upload"-->
              <el-upload
                action="http://vueshop.pixiv.download/api/private/v1/upload"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headersObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">商品内容
              <!-- 富文本编辑器 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加按钮 -->
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" >
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex:'0',
      //添加商品表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        //商品所属分类数组
        goods_cat:[],
        //图片的数组
        pics:[],
        //商品详情描述
        goods_introduce:'',
        //商品参数
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          {required:true,message:'请输入名称',trigger:'blur'}
        ],
        goods_price:[
          {required:true,message:'请输入价格',trigger:'blur'}
        ],
        goods_weight:[
          {required:true,message:'请输入重量',trigger:'blur'}
        ],
        goods_number:[
          {required:true,message:'请输入数量',trigger:'blur'}
        ],
        goods_cat:[
          {required:true,message:'请选择商品分类',trigger:'blur'}
        ]
      },
      //商品分类列表
      cateList:[],
      //
      cateProps:{
         expandTrigger: 'hover',
         label:'cat_name',
         value:'cat_id',
         children:'children'
      },
      //动态参数列表数据
      manyTableData:[],
      //静态属性参数列表
      onlyTableData:[],
      //upload请求头
      headersObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      //预览 图片地址
      previewPath:'',
      //控制图片预览显示
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    //或区商品分类
    async getCateList(){
      const{data:res}=await this.$http.get('categories')
       if(res.meta.status !==200) 
        return this.$message.error('获取商品分类失败')

       this.cateList=res.data
    },
    //级联选择器变化时
    handleChange(){
      if(this.addForm.goods_cat.length!==3){
        this.addForm.goods_cat=[]
      }
    },
    //切换标签页
    beforeTabLeave(activeName,oldActiveName){
      if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
        this.$message.error('请先选择分类')
        return false
      }
    },
    //Tabs点击事件
    async tabClicked(){
      //证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{sel:'many'}})
        if(res.meta.status !==200) return this.$message.error('获取动态参数失败')
        res.data.forEach(item=>{
         item.attr_vals= item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData=res.data
      }
      if(this.activeIndex==='2'){
        const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{sel:'only'}})
        if(res.meta.status !==200) 
          {return this.$message.error('获取静态参数失败')}
        this.onlyTableData=res.data
      }
    },
    //处理图片预览事件
    handlePreview(file){
      console.log(file)
      this.previewPath=file.response.data.url.re
      this.previewVisible=true
    },
    //处理一处图片操作
    handleRemove(file){
      //获取删除图片的临时路径
      const filePath=file.response.data.tmp_path
      //从数组中找到这个图片的对应的索引值
      const i= this.addForm.pics.findIndex(x=>{
        x.path===filePath
      })
      //调用split方法移除该图片
      this.addForm.pics.splice(i,1)
    },
    //监听图片上传成功事件
    handleSuccess(response){
      //拼接的到图片信息对象
      const picInfo={
        pic:response.data.tmp_path
      }
      //将图片信息对象，push到pic数组中
      this.addForm.pics.push(picInfo)
    },
    //添加商品
    add(){
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) 
          return this.$message.error('请填写必要的表单项目')
        //执行添加逻辑
        const form=_.cloneDeep(this.addForm)
        form.goods_cat=form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo={attr_id:item.attr_id,
          attr_value:item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item=>{
          const newInfo={attr_id:item.attr_id,
          attr_value:item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs=this.addForm.attrs
        console.log(form)

        //发起请求添加商品
        //商品名称必须唯一
        const {data:res}=await this.$http.post('goods',form)
        console.log(res)
        if(res.meta.status !==201) 
          return this.$message.error('添加商品失败')

        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
}
}
</script>

<style lang='less' scoped>
.checkbox{
  margin:0 5px 0 0 !important
}
.btnAdd{
  margin-top: 10px;
}
</style>